it makes me wonder if they ship why I haven't found any of their brews in the Pittsburgh area

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In the case of the OP, the term 'ship' means "direct shipping of their beer to consumers (in states where allowed by law)". If you haven't found the beers, it's because you haven't ordered it.

No brewery that I ever heard of ships beer out of state direct to retailers and, in most if not all states, that would violate the beer excise tax laws (unless the retailer paid it, as is the case in DC). Also, considering the expense of small package shipping (vs trucking), it would make those beers particularly expensively.